Color

#2b15ef

#2b15ef
hex#2b15ef
rgbrgb(43, 21, 239)
hslhsl(246, 87%, 51%)
oklchoklch(0.45 0.285 269.6)
Closest name: Bluebonnet (#1c1cf0)Relative luminance 0.0728

Colors that go with #2b15ef

Charcoal, Crimson and Cobalt Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#d9ef15

#156cef · #9815ef

#ef2b15 · #15ef2b

Split-complementary

Open in tool →

#ef9815 · #6cef15

#ef156c · #d9ef15 · #15ef98

Contrast

#2b15ef as textRatioAAAA largeAAAFix
Aaon white
8.55:1passpasspassPasses AAA — no fix needed.
Aaon black
2.46:1failfailfail
  • AA: use #6c5df4 as the text (4.51:1)
  • AAA: use #9388f7 as the text (7.11:1)
  • AA: or shift the background to #bdbdbd (4.55:1)
  • AAA: or shift the background to #ebebeb (7.17:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #2b15ef as the background.

Brands using this color

Fonts for this mood

#2b15ef reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #2b15ef
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #2b15ef and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/2b15ef-a59cc4-dfa74e-271f2d-e9ecf1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md